My bad.... My winters are 18s.Nice to know the 17" wheels will fit the larger brakes on the gt. I had winter tires for the g37s, made the car totally driveable in the snow (rwd).
If I were to get the k5 g5, i'd probably go one winter without (work from home). See how it goes. Size wise, 215/225 would be better (and cheaper). Just need to be gingerly with the throttle and turning.